Bechtle Help Centre.

Authorised users can save several invoice addresses under ‘Addresses & Payment’. You can add, modify or delete addresses as required. It is also possible to copy an invoice address to your shipping addresses. Users can select an invoice address from the list during checkout.
Default addresses are displayed during the order process, but can be be changed for each order.If you are not authorised, you can only use the address allocated to you during the checkout process.